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CLASS_11_MATHS_SOLUTIONS_NCERT

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Class XI Chapter 13 – Limits and Derivatives Maths<br />

______________________________________________________________________________<br />

1cos<br />

x <br />

<br />

x<br />

<br />

= lim<br />

<br />

x0<br />

sin x <br />

<br />

x<br />

<br />

<br />

1cos<br />

x<br />

lim<br />

x0<br />

= x<br />

sin x<br />

lim<br />

x0<br />

x<br />

= 0 1cos x sin x <br />

lim 0and lim 1<br />

1 <br />

<br />

x0 x<br />

x0<br />

<br />

x <br />

<br />

= 0<br />

Question 22:<br />

tan 2x<br />

lim<br />

<br />

x<br />

<br />

2 x <br />

2<br />

Solution 22:<br />

tan 2x<br />

lim<br />

<br />

x<br />

<br />

2 x <br />

2<br />

0<br />

At x = , the value of the given function takes the form 2 0<br />

<br />

<br />

Now, put x y So that x , y 0<br />

2 2<br />

tan2<br />

<br />

y<br />

<br />

tan2x<br />

<br />

2<br />

<br />

lim<br />

lim<br />

<br />

<br />

x<br />

y0<br />

y<br />

2 x <br />

2<br />

tan <br />

2y<br />

= lim<br />

y 0<br />

y<br />

tan2y<br />

= lim tan <br />

2y<br />

tan2y<br />

y0<br />

y<br />

<br />

<br />

sin2y<br />

= lim<br />

y0<br />

y cos2 y<br />

=<br />

sin2y<br />

2 <br />

y<br />

<br />

<br />

<br />

lim <br />

y0<br />

2 y cos2<br />

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